Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
van thanh » ban thanh, van tuan
thu sach » tu sach, thuat sach, thuoc sach
cham duc » pham duc, cham soc, pham duy
cua tre » cuu tre, cua triet, dua tren
duc van » duc va, duc tan, duc manh
va cham » va chat, va tham
sach tu » sach thu, cach tu, sach ty
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
tang ma » mang may, tang van
cua te » cua tu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach tu ((tang ma) or (lang xa)) hoi. hieu va cham duc van thanh tai ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach tu ((tang ma) OR (lang xa)) hoi. hieu va cham duc van thanh tai ((cua tre) OR (cua te))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach tu ((tang ma) or (lang xa)) hoi. hieu va cham duc van thanh tai ((cua tre) OR (cua te))*".